Python2.7
print "hello"
hello
Python3.0
print "hello"
File "tmp.py", line 1
print "hello"
^
SyntaxError: invalid syntax
Python3.0
print("hello")
hello
Python2.7
print {}.keys()
[]
Python3.0
print({}.keys())
<dict_keys object at 0x385f50>
Python2.7
print None < None
False
Python3.0
print(None < None)
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
print(None < None)
TypeError: unorderable types: NoneType() < NoneType()
Python2.7
print 1 / 2
0
Python3.0
print(1 / 2)
0.5
Python2.7
print 055
45
Python3.0
print(055)
File "tmp.py", line 1
print(055)
^
SyntaxError: invalid token
Python3.0
print(0o55)
45
Python2.7
print long(987654321*987654321)
975461057789971041
Python3.0
print(long(987654321*987654321))
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
print(long(987654321*987654321))
NameError: name 'long' is not defined
Python3.0
print(int(987654321*987654321))
975461057789971041
Python2.7
print u"\u0024"
$
Python3.0
print(u"\u0024")
File "tmp.py", line 1
print(u"\u0024")
^
SyntaxError: invalid syntax
Python3.0
print("\u0024")
$
Python2.7
if (isinstance("string", basestring)):
print "True"
True
Python3.0
if (isinstance("string", basestring)):
print("True")
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
if (isinstance("string", basestring)):
NameError: name 'basestring' is not defined
Python3.0
if (isinstance("string", str)):
print("True")
True
Python2.7
True = "True"
(no output)
Python3.0
True = "True"
File "tmp.py", line 1
True = "True"
SyntaxError: assignment to keyword
Python2.7
False = "False"
(no output)
Python3.0
False = "False"
File "tmp.py", line 1
False = "False"
SyntaxError: assignment to keyword
Python2.7
try:
print 1+1
except ValueError, err:
print err
2
Python3.0
try:
print(1+1)
except ValueError, err:
pass
File "tmp.py", line 3
except ValueError, err:
^
SyntaxError: invalid syntax
Python3.0
try:
print(1+1)
except ValueError as err:
print(err)
2
Python2.7
print [x for x in 1, 2, 3]
[1, 2, 3]
Python3.0
print([x for x in 1, 2, 3])
File "tmp.py", line 1
print([x for x in 1, 2, 3])
^
SyntaxError: invalid syntax
Python3.0
print([x for x in (1, 2, 3)])
[1, 2, 3]
Python2.7
print ''.join([`x` for x in (1,2,3)])
123
Python3.0
print(''.join([`x` for x in (1,2,3)]))
File "tmp.py", line 1
print(''.join([`x` for x in (1,2,3)]))
^
SyntaxError: invalid syntax
Python3.0
print(''.join([repr(x) for x in (1,2,3)]))
123
Python2.7
print 1 <> 2
True
Python3.0
print(1 <> 2)
File "tmp.py", line 1
print(1 <> 2)
^
SyntaxError: invalid syntax
Python3.0
print(1 != 2)
True
Python2.7
exec = "exec"
File "tmp.py", line 1
exec = "exec"
^
SyntaxError: invalid syntax
Python3.0
exec = "exec"
(no output)
Python2.7
print buffer("Hello world")
Hello world
Python3.0
print(buffer("Hello world", 6, 5))
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
print(buffer("Hello world", 6, 5))
NameError: name 'buffer' is not defined
Python3.0
print(repr(memoryview(b"Hello world")))
<memory at 0x3c3660>
Python2.7
print {"a":1}.has_key("a")
True
Python3.0
print({"a":1}.has_key("a"))
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
print({"a":1}.has_key("a"))
AttributeError: 'dict' object has no attribute 'has_key'
Python3.0
print("a" in {"a":1})
True
Python3.0
import _winreg
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
import _winreg
ImportError: No module named _winreg
Python2.7
import ConfigParser
(no output)
Python3.0
import ConfigParser
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
import ConfigParser
ImportError: No module named ConfigParser
Python3.0
import configparser
(no output)
Python2.7
import copy_reg
(no output)
Python3.0
import copy_reg
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
import copy_reg
ImportError: No module named copy_reg
Python3.0
import copyreg
(no output)
Python2.7
import Queue
(no output)
Python3.0
import Queue
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
import Queue
ImportError: No module named Queue
Python3.0
import queue
(no output)
Python2.7
import SocketServer
(no output)
Python3.0
import SocketServer
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
import SocketServer
ImportError: No module named SocketServer
Python3.0
import socketserver
(no output)
Python2.7
import markupbase
(no output)
Python3.0
import markupbase
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
import markupbase
ImportError: No module named markupbase
Python3.0
import _markupbase
(no output)
Python2.7
import repr
(no output)
Python3.0
import repr
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
import repr
ImportError: No module named repr
Python3.0
import reprlib
(no output)
Python2.7
import test.test_support
(no output)
Python3.0
import test.test_support
Traceback (most recent call last):
File "tmp.py", line 1, in <module>
import test.test_support
ImportError: No module named test_support
Python3.0
import test.support
(no output)
Python2.7
import string
print string.letters
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
Python3.0
import string
string.letters
Traceback (most recent call last):
File "tmp.py", line 2, in <module>
string.letters
AttributeError: 'module' object has no attribute 'letters'
Python3.0
import string
print(string.ascii_letters)
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
Python2.7
import string
print string.uppercase
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Python3.0
import string
string.uppercase
Traceback (most recent call last):
File "tmp.py", line 2, in <module>
string.uppercase
AttributeError: 'module' object has no attribute 'uppercase'
Python3.0
import string
print(string.ascii_uppercase)
ABCDEFGHIJKLMNOPQRSTUVWXYZ
Python2.7
import string
print string.lowercase
abcdefghijklmnopqrstuvwxyz
Python3.0
import string
string.lowercase
Traceback (most recent call last):
File "tmp.py", line 2, in <module>
string.lowercase
AttributeError: 'module' object has no attribute 'lowercase'
Python3.0
import string
print(string.ascii_lowercase)
abcdefghijklmnopqrstuvwxyz